Air Force, HUA!
Yes I have killed a full health tank, single handedly with a bat. It was on the roller coaster during dark carnival, so I ran circles while while whacking the tank. I had no ammo, it was a laggy server, and it was a bad tank player. The rest of the infected were after my two runner teammates, but I stayed behind to pick someone up. The fight was easily 2 minutes long, and though I vanquished the tank, neither of us made it to the safe room. Obviously, I play L4D2...alot.
Please stop asking me if I really did kill a full health tank with a bat. My name alone should say enough.
Don't give me too much credit. Laggy server, bad tank player, and some luck.